Improvement in bark-mills



N iltttrd gratte prima )pitre WILLIAM TANSLEY, OF SALISBURY CENTRE,ASSIGNOR TO STARBUOK BROTHERS, OF TROY, NEW YORK.

` Letters Patent No. 97,989, dated December 14, 1869.

IMPROVEMENT IN BARR-MILLS.

... awww The Schedule referred to in these Letters Patent and makingpart of the same T0 au Whom t ma?! Concern: The base of the lower coneis provided with arms 'Beit known that I, VILLIAM TANSLEY, of Salis- G,G, Ste., merging at the centre, and forming a bearbury Centre, in thecounty of Herkimer, and State of ing, through which the shaft B passes,andprojecting New York, have invented certain new and useful Imdownwarda short distance, forming stops, against provements in Bark-Mills; Vanddo hereby declare the which the driver J comes in contact, as will bepresfollowing to be` a full, clear, and exact description entlyexplained, and extending upward a short dis thereof, reference being hadto the accompanying tance, and forming a ring, K, which fits into theholdrawings, makng'part of this specification, and `,in low bearing Lofthe core M. whichl -The shait B passes up through the shoulders of theFigure lis a side elevation of my improved mill; arms a, (which aresecured to the lower side of the Figure 2, a vertical section throughthe centre of curb, at the ears c, and support the same. in a xed thesame; position,) through the ring K, and up through the Figure 3, a topview of the same; centre ot the core M, and is provided with a suitableFigure 4, a side view of the runner and shaft; and bark-breaker, O,which is secured to the shaft by Figure 5, a central vertical sectionofthe runner. means of a feather.

The object of my improved mill is to so arrange the To the lower part ofthe shaft B, and the proper l grinders or graters on both the revolvingand station distance from the end, is cast, or otherwise securedaryparts of the mill, one above the other, that the thereon, a driver,J, which, when the shaft is in posihark, coarsely ground bythe upper',is discharged dition, is interlocked between the shoulders H of therect-ly into the lower grinding-surfaces, where it is rearms G, so thatthe rotation ofthe said shaft produces ground to the requisite neness,and more evenly a similar movement of the runner F.

than has heretofore been done, wherethe bark re- The ring'or annularjournal K, tting up into the quired rehandling before being inished.central hollow bearing L, keeps the stationary and To enable thoseskilled` in the art to make and use revolving parts true, one with theother. my improved mill, I will proceed to describe the same, A hoppermay be attached to the top of the curb, referring byletters to thedrawings, ,similar letters deto the ears c, by means oi' bolts. notinglikeparts in the several views. The formation of the steps, on the apexof the up- A represents the curb of the mill, provided at to per cone ofthe runner hereinbefore mentioned, proand bottom with earsc, for thepurpose presently exvides grippers, which, when `the runner is inmotion,

plained. grasp the bark, and drag it into the space between the Thiscurb has what I willl designate a core, M, and grinding-surfaces, andforce it down. i the interior face of the curb proper and exterior faceI am aware that bark-mills have been `heretofore of the core areserrated, or provided with grindingconstructed with `concentric conicalrings, forming an l teeth, in Vtwo sets, the faces being dividedlongitudiinside and outside or double grindiiig-surface.` nally, theupper set O being coarse, andthe lower' one, I am also aware that millshave been made, having I), tine; `the teeth of the former having a pitchof one runner above another, each runner acting indeabout one inch andaneighth, and the latter, a pitch pendently of, and discharging itsgrindings at a dilferof' about ahalf inch. ent outlet from the other. Ido not wish to claim The core M is held in position, and leaving ananany of these features; but having described the connular space betweenit and the iiiterior face of the struction and operation of my improvedmill,

curb proper, by means ot' arms E. IVhat I claim as new, and desire tosecure by Let# .The coreis hollow, and has arranged therein centersPatent, isl trally a hollow bearing, L, for the purpose hereinafter 1.Constructing the upper conical ring of the runspecified. i ner with aseries of steps, supported on a continuous l y F is the runner, formedof two concentric conical concentric base, and provided with interiorandextei rings,rthe base of the upper resting on the apex 'of riorgrinding-teeth, substantially in the manner and the lower. 'The innerand. outer peripheries oi' both for the purposeset forth. are serrated*or tinted to correspond with the two sets 2. In combination withtheabove, the upper and of grinding-teeth on the core M and the curb A.lower grinding-sin'faces G and D, one directly over The apex ofthe uppercone of the runner is cut the other, the upper discharging thecoarsely-ground away, forming a series of steps 1, 2, `3, 85e., the saidmaterial into the lower, substantially in the manuel' steps projectingabout equal to the pitch ofthe teeth, audvfor the purpose setforth. and`dropping about three-quarters of an ,inch to the 3. The central hollowbearing L 0f the core M, in step,` the number of steps depending uponthe size of combination wit-h the ring or annular journal K, the runner,a base-ring being leftfor support. arms G, `(having stops H,) and shaftB, withthc driver J, all constructed and operating substantially lower,where the bark is .finely ground.y and finished,

as described, for the purpose set fort-h. substantially as and for thepurpose set forth.

4. In bark or other mills, the combination aud a-r- In testimonywhereof, I have hereunto'set my hand, rangement of the upper and lowercontinuous grindthis 18th day of August, A D. 1869. ing-surfaces, thebuse of the former resting upon and Witnesses: VILLIAM TANSLEY. slightlyprojecting vover the top of the latter, grind- L. D. GILMAN,

ing coarsely and evenly, and discharging into the FRANK H. RICHARDS.

